/*
 * Copyright (c) 2023 OceanBase.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.oceanbase.connector.flink.table;

import org.apache.flink.table.types.logical.LogicalType;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

public abstract class AbstractRecordSerializationSchema<T> implements RecordSerializationSchema<T> {

    private final Map<LogicalType, SerializationRuntimeConverter> converters =
            new ConcurrentHashMap<>();

    protected SerializationRuntimeConverter getOrCreateConverter(LogicalType type) {
        return converters.computeIfAbsent(type, this::createConverter);
    }

    protected abstract SerializationRuntimeConverter createNotNullConverter(LogicalType type);

    private SerializationRuntimeConverter createConverter(LogicalType type) {
        return wrapIntoNullableConverter(createNotNullConverter(type));
    }

    private static SerializationRuntimeConverter wrapIntoNullableConverter(
            SerializationRuntimeConverter converter) {
        return new SerializationRuntimeConverter() {

            private static final long serialVersionUID = 1L;

            @Override
            public Object convert(Object data) {
                if (data == null) {
                    return null;
                }
                return converter.convert(data);
            }
        };
    }
}
